Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, openWorldHint=false and destructiveHint=false, so safety is covered; the description adds genuinely new behavioral context: the failure mode is silent ('Nothing errors and nothing shows in the UI'), impact is delayed ('lost search traffic'), output is sorted by productsCount descending, and auth is bearer token. It stops short of describing pagination or default page size behavior on a paginated endpoint, so it is strong but not complete.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The value proposition and the silent-failure motivation are front-loaded, and the sibling disambiguation is compact. Five sentences is a bit long for a list endpoint, but each carries distinct information rather than restating the name.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description explains the domain relationship (3Dsellers catalog category → channel's own category) and the ordering of results, which is what an agent needs to interpret the response in the absence of an output schema. The gap is operational: nothing explains the type enum distinction or pagination expectations across five optional parameters.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is only 20% — only 'channel' is documented (and the description reinforces that omission means check across all). The four other parameters, including the 'type' enum with primary_category vs store_category, page, limit and sellerId, get no explanation anywhere, and a low-coverage schema requires the description to compensate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ('List catalog categories that have NO channel category') plus the scope qualifiers (per seller and channel) and the consequence for those products. It also explicitly rules out the two nearest siblings, get-product-categories and get-channel-category-fields, so an agent can discriminate without opening a schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives concrete trigger conditions — 'Run it on day one of an onboarding, and after any bulk import' — and pairs them with an explicit negative definition of the sibling tools it is not. This is textbook when-to-use guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.